character: Rudolf Virchow
topic: Contribution to Cell Theory
grade: 9
subject: Biology
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character: Theodor Schwann
topic: Cell Theory and Animal Cells
grade: 9
subject: Biology
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character: Matthias Schleiden
topic: Cell Theory and Plant Cells
grade: 9
subject: Biology
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character: Louis Pasteur
topic: Biogenesis and Cell Theory
grade: 9
subject: Biology
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